Hull plate in ice-transiting ships can sustain significant local damage during operation as a result of ice impact, and therefore isolated regions of ship plate are plastically deformed. Four grades of ship plate (B, EH36, DH36, NVF 440) with a range of as-received toughness characteristics were deformed to two levels of cold work (10 % and 20 % tensile strains, thickness reductions of 8 % and 15 %) and their toughness measured. Increasing the amount of cold deformation caused deterioration in toughness in two ways: an increase in the brittle to ductile transition temperature, and a drop in resistance to ductile tearing. The former will raise the service temperature at which brittle fracture initiation is possible and the second will enhance the risk of developing long ductile fractures. It was found that significant deterioration of toughness occured for all four steels for deformation of the order of 10 %. Implications for the integrity of damaged hull structure as a result of the deterioration in toughness is discussed.
Effects of plastic deformation on fracture toughness of ship plate steels
Die Einflüsse der plastischen Verformung auf die Bruchzähigkeit von Schiffsblechstählen
Canadian Metallurgical Quarterly ; 36 , 1 ; 39-47
1997
9 Seiten, 8 Bilder, 6 Tabellen, 10 Quellen
Article (Journal)
English
Fracture toughness of ship steels
Tema Archive | 1989
|Investigation of notch-toughness properties of ABS ship plate steels
Engineering Index Backfile | 1962
|Fracture toughness of grade D ship steel
Tema Archive | 2006
|Failure resistance and fracture toughness of sintered steels
Tema Archive | 2000
|Failure Resistance and Fracture Toughness of Sintered Steels
British Library Conference Proceedings | 2001
|